1. Русак , О.Н., Николаев , Ю.Н.: of the. Записки Горного института. 58, 169-173 (1969)

1. Rusak , O.N., Nikolaev , Y.N.: To On the question of underground thermal insulation of horizons insulation at the mines of the Apatit Combine. Journal of Mining Institute. 58, 169-173 (1969)